A millstone around your neck is a problem that prevents you from doing what you want to do.

“I cannot go out anywhere even for a couple of hours,” grumbled Sumathi, “My aged father-in-law lives with us and he is a millstone around my neck.”

Mince Words :

If people mince words or mince their words, they don’t say what they really mean clearly.

Mind One’s P’s And Q’s :

To be careful and particular about one’s own behaviour

One distinctive trait of all noble souls is that they always mind their P’s and Q’s.

Mind over Matter :

This idiom is used when someone uses their willpower to go above adversity.

Mind The Gap :

Mind the gap is an instruction used on the underground in the United Kingdom to warn passengers to be careful when leaving the tube or train as there is quite a distance between the train and the platform.

Mind Your Own Beeswax :

This idiom means that people should mind their own business and not interfere in other people’s affairs.

Mind Your P’s And Q’s :

This is used as a way of telling someone to be polite and behave well.

If you are careful about the way you behave and are polite, you mind your P’s and Q’s.

Mint Condition :

If something is in mint condition, it is in perfect condition, often brand new.

“I could not believe that you have bought this car in second sale,” said Rajan to me, “it is very much in mint condition.”

Misery Guts :

A misery guts is a person who is always unhappy and tries to make others feel negative.

Miss is As Good As A Mile. :

A miss is as good as a mile means that if you fill, even by the smallest margin, it is still a failure.